Improvement in locks



UNITED STATES lPrrrEIwr OFFICE.

vF.' G. SHALLING, OF SOMERSET, MASSACHUSETTS.

IMPROVEMENT iN LCKS.

lSpecification forming part of Letters Patent No. 36,919, dated November 11, 1862.

scription of the same, reference beinghad to the accompanying drawings, making apart of this specification, 'in which- Figure l is an internal viewof my Invention, the case of thev lock being bisected,.as` indicated by the line lsv Fig. 2;Fig. 2, a horizontal section of the same, taken in the line y 37, Fig. l; Fig. 3, a detached View of the saine.

Similar letters of reference indicate corresponding parts in the several iiglires.

The object of this invention is to .obtain a lock of simple andecononnical construction',

'which cannot be picked.'v or ilieg'itimately opened, and which may be applied to doors, drawers,trunks, or used in any case where a lock can be applied. l

To enable those skilled in the art to fully understand and construct-my invention, l will proceed to describe it.

A represents the case of the lock, which maybe of rectangular form, and `has three sliding tumblers, BBB, fitted within it. These tumblers are each provided withV a notch, a, in their lower edges near'one end ofthem,

n and into these notches'the upper.endsbf` levers C fit, said levers being all placed. on one and the same fulcrum-pin b, and having springs c bearingagainst their lower ends, which springs have a tendency to keep the tumblers in contact with astop, d, in the-ease, as will 'beffnlly understood by referring to Fig. l. Each tumbler B hasv au inverted T- sliapedslot, e,made in to receive a hasp or eye, D, which passes into the case through an opening, c, in its upper edge, as shown in Fig. 1, and the springs c of the lever G have a tendency to keep the right-hand, edges of the slots ein the eye D, and4 thereby secure the'latte'r in the case A. In order, therefore,

to release the eye D and unlock the lock, the tumblers B must be thrown back in order to bring the vertical parts of the slots e in line with each other, and, in order Ate render this releasing movement of the' tu'mblers as complex as possible, the slots e may have varying positions in the tumblers, so that each of the :fatter will require to beY 'moved a different distance in order `toeii'ect the result above specified.

E represents a stop, which is formed of a, lhorizontal plate attached to the upper end of a vertical bar, F, placed against the inner surface of one end of the case A, the bar F havin'g a spring, G; connected to it which has a'tendency to keep the stop E down back' o1 the tnmblers B and prevent them from being shoved back in order to release the'eye D.

H is a plate, whicliis` fitted on a pivot, f,

in the case A, and is provided with a lip, lg,

which projects underneath the stop E. The plate H extends down within the path of the 'movement ofthe bitsk of the key I of the lock. When the key I is inserted in the lock and turned, it .first strikes' against the lower part of the plate H, which is Ithereby turned, so that the lip y will raise the stop E, and the stop is kept elevated above the tumblers, while the bits act upon'- the latter and shove them so as to bring the vertical parts of the slot e in line witheach other and adH mit of the eye D being raised out from the lock-case, By this arrangement it will be seen that the stopf- E must first be raised in `order to admit of the tumblers rl?) beingv shoved or operated, and the stop requires to be held up while the Ytumblers are being operated, or else itwillbe forced down under the actionV oi' the spring G. Thestop and tumblers therefore require to be acted upon simultaneously, aresult which admits of .the

use of theproper key only in unlocking the lock.

y The lock within described is a trunk or i desk lock; but the same arrangement ofparts may be applied to an ordinary sliding-bolt lock with a very slight modification, which 

